Astroscan 7000000 User Manual page 9

SATURN
This infamously ringed planet can be a
fantastic sight through your scope. The tilt-
angle of the rings varies over a period of many
years, so they may be seen edge-on (like a thin
line) or broadside (like giant "ears" on each
side of the planet). You will need a good
steady atmosphere to achieve a worthwhile
view of Saturn. If you look closely enough, you
can see the Cassini division - a thin, dark gap
in the rings. You can also often make out one or
more of Saturn's moons, including the largest -
Titan.
VENUS
At its brightest, Venus is the most luminous of
all the planets - so bright that it is occasionally
visible in full daylight. Venus appears as only
a thin crescent at its brightest, and it is never
found far from morning or evening horizon.
No surface detail can be seen on Venus as it is
surrounded by dense cloud cover.
MARS
Mars makes a close approach to our planet
once every two years, which is the best time
to observe it. With your telescope, you'll be
able to see a salmon colored disk marked with
dark patches and possible a whitish polar ice
cap. Surface detail on Mars is only observable
during prime conditions with a high-power
eyepiece.
DEEP-SKY OBJECTS
With dark skies, ideal viewing conditions, and
a large telescope, you can observe a huge
number of amazing objects outside our solar
system - commonly referred to as "deep-sky
objects". These include star clusters, galaxies,
gaseous nebulas, and more. Your Dobsonian
is well equipped
necessary to view these objects, but you will
need to find a viewing site well away from
light pollution and give your eyes plenty of time
to fully dark-adapt.
As you continue to view, your eyes will
become trained, and more and more subtle
details from these
apparent. Don't expect to see color, however,
as human eyes are not sensitive enough to
distinguish color from faint light.
to gather the light
objects will become
ASTRONOMY FORMULAS
MAGNIFICATION
To determine the
telescope and eyepiece combination, divide
the telescope focal length be the eyepiece
focal length.
Magnification (x) =
Ex: 17mm Eyepiece with a 114x450mm telescope.
Magnification = 450/17mm
Magnification = 26.5x
FOCAL RATIO
To determine the focal ratio of a telescope,
divide the focal length of the telescope by
the aperture.
Focal Ratio (f/x) =
Telescope Focal Length (mm)
Ex: Focal Ratio of a 114x450mm telescope.
Focal Ratio (f/x)= 450/114mm
Focal Ratio (f/x)=f/3.95
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magnification of
Telescope Focal Length (mm)
Eyepiece Focal Length (mm)
Aperture (mm)
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